| 摘要 |
A duplex stainless steel sheet which contains, in mass%, 0.03% or less of C, 0.3% or less of Si, 3.0% or less of Mn, 0.040% or less of P, 0.008% or less of S, 0.2-2.0% of Cu, 5.0-6.5% of Ni, 23.0-27.0% of Cr, 2.5-3.5% of Mo, 1.5-4.0% of W and 0.24-0.40% of N, with the balance made up of Fe and impurities. This duplex stainless steel sheet has a s phase sensitivity index X (= 2.2Si + 0.5Cu + 2.0Ni + Cr + 4.2Mo + 0.2W) of 52.0 or less, a strength index Y (= Cr + 1.5Mo + 10N + 3.5W) of 40.5 or more, and a pitting resistance equivalent PREW (= Cr + 3.3(Mo + 0.5W) + 16N) of 40 or more. This duplex stainless steel sheet has excellent corrosion resistance and excellent embrittlement cracking resistance. |
